Hi,

on thegearpage forums Alan replied to me as follows on activating H9 tuner with CC and it works for me:

Go into System mode by pressing and holding both the Right Footswitch and the HotKnob Button.

Turn the Big Knob until you see "MIDI" and press the Big Knob button to enter the MIDI menu.

Scroll the Big Knob until you see "RCV.CTL" and press the Big Knob Button to enter the MIDI Receive Control menu.

On the left you will see various things which can be controlled by MIDI
CCs. Turn the Big Knob until you see "TUN" which is the last item. Now
press the Right Footswitch to assign any MIDI CC you want to access the
Tuner.

Matteo